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The effect of gamma irradiation on space charge behaviour and dielectric spectroscopy of low-density polyethylene

The effect of gamma irradiation on space charge behaviour and dielectric spectroscopy of low-density polyethylene
The effect of gamma irradiation on space charge behaviour and dielectric spectroscopy of low-density polyethylene
The influence of gamma irradiation on low-density polyethylene (LDPE) has been studied through space charge measurement and dielectric spectroscopy. Commercial LDPE film with a thickness of 100?m was irradiated with ?-rays at a dose rate of approximately 10kGy/h to different doses up to 100kGy in an atmosphere of air, vacuum and nitrogen respectively. Space charge profiles vary depending on irradiation environments and radiation dose. The space charge profile of a sample after irradiation at 100kGy in air is more complicated than those irradiated in vacuum and nitrogen at same dose. More importantly, the space charge decay rate for the irradiated samples is slower than that of the virgin sample, indicating that the irradiation had changed the material by the generation of deep traps for space charge. Irradiation in air also produced changes in the dielectric spectrum in the frequency range between 10-3Hz and 106Hz where the imaginary part of the permittivity was found to be about one order of magnitude higher than that of the virgin sample (~10-4). This was attributed to oxidation as samples with the same (or lower) radiation dose in vacuum or nitrogen showed no pronounced difference to that of virgin samples.
Gamma irradiation, space charge, LDPE, dielectric spectroscopy, activation energy
1-4244-0750-8
442-445
Fu, M.
b28f7ad3-ed00-4bbe-9701-73306be5b7d0
Chen, G.
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Dissado, L. A.
a1be9089-d1da-450b-93ef-eb055853c9c3
Fothergill, J. C.
8a8bc487-7310-4bc7-ada8-88ce9e780d30
Zou, C.
d6b46f81-bf2a-4bef-bbb8-336b75583c61
Fu, M.
b28f7ad3-ed00-4bbe-9701-73306be5b7d0
Chen, G.
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Dissado, L. A.
a1be9089-d1da-450b-93ef-eb055853c9c3
Fothergill, J. C.
8a8bc487-7310-4bc7-ada8-88ce9e780d30
Zou, C.
d6b46f81-bf2a-4bef-bbb8-336b75583c61

Fu, M., Chen, G., Dissado, L. A., Fothergill, J. C. and Zou, C. (2007) The effect of gamma irradiation on space charge behaviour and dielectric spectroscopy of low-density polyethylene. At 2007 IEEE International Conference on Solid Dilectrics 2007 IEEE International Conference on Solid Dilectrics, United Kingdom. 08 - 13 Jul 2007. pp. 442-445.

Record type: Conference or Workshop Item (Other)

Abstract

The influence of gamma irradiation on low-density polyethylene (LDPE) has been studied through space charge measurement and dielectric spectroscopy. Commercial LDPE film with a thickness of 100?m was irradiated with ?-rays at a dose rate of approximately 10kGy/h to different doses up to 100kGy in an atmosphere of air, vacuum and nitrogen respectively. Space charge profiles vary depending on irradiation environments and radiation dose. The space charge profile of a sample after irradiation at 100kGy in air is more complicated than those irradiated in vacuum and nitrogen at same dose. More importantly, the space charge decay rate for the irradiated samples is slower than that of the virgin sample, indicating that the irradiation had changed the material by the generation of deep traps for space charge. Irradiation in air also produced changes in the dielectric spectrum in the frequency range between 10-3Hz and 106Hz where the imaginary part of the permittivity was found to be about one order of magnitude higher than that of the virgin sample (~10-4). This was attributed to oxidation as samples with the same (or lower) radiation dose in vacuum or nitrogen showed no pronounced difference to that of virgin samples.

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More information

Published date: 2007
Additional Information: Event Dates: 8th -- 13th July 2007
Venue - Dates: 2007 IEEE International Conference on Solid Dilectrics, United Kingdom, 2007-07-08 - 2007-07-13
Keywords: Gamma irradiation, space charge, LDPE, dielectric spectroscopy, activation energy
Organisations: Electronics & Computer Science, EEE

Identifiers

Local EPrints ID: 264317
URI: https://eprints.soton.ac.uk/id/eprint/264317
ISBN: 1-4244-0750-8
PURE UUID: 0c878dfd-c889-44a1-9faa-b483fac21bb9

Catalogue record

Date deposited: 17 Jul 2007
Last modified: 18 Jul 2017 07:37

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